Re: quota and snapshots in 6.1-RELEASE

On Thu, Jun 29, 2006 at 10:48:06PM -0400, Mike Jakubik wrote:
Konstantin Belousov wrote:
On Tue, Jun 06, 2006 at 01:49:04PM -0400, Mike Jakubik wrote:

Scott Long wrote:

Dmitriy Kirhlarov wrote:


Hi!

On Tue, May 23, 2006 at 04:35:21PM -0400, Kris Kennaway wrote:



6.1-STABLE after 6.1-RELEASE is releases. So I think you may want

If you use snapshots with your quotas, update to 6.1-STABLE. If you

Sorry, guys. You are mean RELENG_6_1 or RELENG_6?

WBR

RELENG_6. However, the changes will likely make their way into
RELENG_6_1 in a few weeks as part of an errata update.

Scott

I have just done tests on 6.1-R and RELENG_6 as of yesterday evening.
Unfortunately both still lock up hard, no crash, just a frozen system. I
cant enter the KDB (ddb) via the console, but its unusable, as it wont
let me type in anything. There must be some other change in -CURRENT
that fixes this, as -CURRENT did not freeze during my previous tests.


Just to confirm, here is the ID of ufs_quota.c on my RELENG_6 system:

/usr/src/sys/ufs/ufs/ufs_quota.c:
$FreeBSD: src/sys/ufs/ufs/ufs_quota.c,v 1.74.2.4 2006/05/14
00:23:27 tegge Exp $

The hangs are mostly related to snapshots. It would be better to
update to the latest RELENG_6.

Hangs on RELENG_6_1 is not so much interesting. For
hanged RELENG_6 system, please do what described below and post
the log of the ddb session.

I'm not sure whether kbdmux was MFCed into RELENG_6 (AFAIR, yes).
If you have it in your kernel, add the line
hint.kbdmux.0.disabled="1"
into the /boot/device.hints to make ddb usable.

After that, on the hang, enter ddb, and
do ps and tr <pid> for all suspected processes.
Better yet, add the following options to your kernel:

options INVARIANTS
options INVARIANT_SUPPORT
options WITNESS
options DEBUG_LOCKS
options DEBUG_VFS_LOCKS
options DIAGNOSTIC

and, after hang, do in ddb

show allpcpu
show alllocks
show lockedvnods
ps

For each process mentioned in show output, do where <pid>
(for threaded processes, do thread <thread-id>; where).

BTW, it would be great to add this instructions to the FAQ.


Well, i finally got around to setting up a serial console on this box,
the following is the output from the debugger after the system stopped
responding. Let me know if you need any more/different information, i
also made the kernel changes you recommended.

FreeBSD 6.1-STABLE #1: Thu Jun 10 00:22:29 EDT 2006

---
KDB: enter: Line break on console
[thread pid 12 tid 100004 ]
Stopped at kdb_enter+0x30: leave
db> ps
pid proc uid ppid pgrp flag stat wmesg wchan cmd
552 c3622830 2 550 549 0004000 [SLPQ flswai 0xc0707c24][SLP] rm
550 c3570830 2 549 549 0004000 [SLPQ wait 0xc3570830][SLP] sh
549 c342ec48 2 548 549 0004000 [SLPQ wait 0xc342ec48][SLP] sh
548 c3622624 0 422 422 0000000 [SLPQ piperd 0xc36027f8][SLP] cron
547 c361f830 0 524 547 0004002 [SLPQ ufs 0xc3777c94][SLP] ls
546 c36bc418 0 544 544 0004002 [SLPQ wdrain 0xc0707be4][SLP]
fsck_4.2bsd
544 c36bcc48 0 511 544 0004002 [SLPQ wait 0xc36bcc48][SLP] fsck
524 c35e020c 0 522 524 0004002 [SLPQ wait 0xc35e020c][SLP] bash
522 c3570c48 0 406 522 0004100 [SLPQ flswai 0xc0707c24][SLP] sshd
515 c36bc20c 0 0 0 0000204 [SLPQ wdrain 0xc0707be4][SLP] md0
511 c36bb624 0 500 511 0004002 [SLPQ wait 0xc36bb624][SLP] bash
509 c3570418 65 1 509 0000100 [SLPQ select 0xc0707644][SLP]
dhclient
500 c361fa3c 0 406 500 0004100 [SLPQ flswai 0xc0707c24][SLP] sshd
480 c342ea3c 0 1 256 0000000 [SLPQ select 0xc0707644][SLP]
dhclient
465 c361f624 0 1 465 0004002 [SLPQ ttyin 0xc342b010][SLP] getty
464 c35e0c48 0 1 464 0004002 [SLPQ ttyin 0xc3429410][SLP] getty
463 c356fa3c 0 1 463 0004002 [SLPQ ttyin 0xc3429810][SLP] getty
462 c356f418 0 1 462 0004002 [SLPQ ttyin 0xc343f010][SLP] getty
422 c342e624 0 1 422 0000000 [SLPQ nanslp 0xc06ba32c][SLP] cron
416 c356f000 25 1 416 0000100 [SLPQ pause 0xc356f034][SLP]
sendmail
412 c356f624 0 1 412 0000100 [SLPQ select 0xc0707644][SLP]
sendmail
406 c35e0000 0 1 406 0000100 [SLPQ select 0xc0707644][SLP] sshd
290 c361f20c 0 1 290 0000000 [SLPQ flswai 0xc0707c24][SLP]
syslogd
256 c3622418 0 1 256 0000000 [SLPQ select 0xc0707644][SLP] devd
145 c356f830 0 1 145 0000000 [SLPQ pause 0xc356f864][SLP]
adjkerntz
38 c3378c48 0 0 0 0000204 [SLPQ - 0xd56f5cf8][SLP] schedcpu
37 c342d000 0 0 0 0000204 [SLPQ sdflush 0xc070a3b4][SLP]
softdepflush
36 c342d20c 0 0 0 0000204 [SLPQ vlruwt 0xc342d20c][SLP] vnlru
35 c342d418 0 0 0 0000204 [SLPQ ufs 0xc363c46c][SLP] syncer
34 c342d624 0 0 0 0000204 [SLPQ wdrain 0xc0707be4][SLP]
bufdaemon
33 c342d830 0 0 0 000020c [SLPQ pgzero 0xc070b324][SLP]
pagezero
32 c342da3c 0 0 0 0000204 [SLPQ psleep 0xc070ae74][SLP]
vmdaemon
31 c342dc48 0 0 0 0000204 [SLPQ psleep 0xc070ae30][SLP]
pagedaemon
30 c342e000 0 0 0 0000204 [IWAIT] irq7: ppc0
29 c342e20c 0 0 0 0000204 [IWAIT] swi0: sio
28 c342e418 0 0 0 0000204 [IWAIT] irq1: atkbd0
27 c3319624 0 0 0 0000204 [SLPQ - 0xc32c943c][SLP] fdc0
26 c3319830 0 0 0 0000204 [IWAIT] irq16: fxp0
25 c3319a3c 0 0 0 0000204 [SLPQ aifthd 0xc3319a3c][SLP]
aac0aif
24 c3319c48 0 0 0 0000204 [SLPQ idle 0xc32c8400][SLP]
aic_recovery0
23 c3378000 0 0 0 0000204 [IWAIT] irq30: ahc0
22 c337820c 0 0 0 0000204 [SLPQ idle 0xc32c8400][SLP]
aic_recovery0
21 c3378418 0 0 0 0000204 [IWAIT] irq9: acpi0
9 c3378624 0 0 0 0000204 [SLPQ - 0xc3321200][SLP] thread
taskq
20 c3378830 0 0 0 0000204 [IWAIT] swi6: +
19 c3378a3c 0 0 0 0000204 [IWAIT] swi6: task queue
8 c32da20c 0 0 0 0000204 [SLPQ - 0xc3321480][SLP] acpi_task2
7 c32da418 0 0 0 0000204 [SLPQ - 0xc3321480][SLP] acpi_task1
6 c32da624 0 0 0 0000204 [SLPQ - 0xc3321480][SLP] acpi_task0
5 c32da830 0 0 0 0000204 [SLPQ - 0xc3321500][SLP] kqueue
taskq
18 c32daa3c 0 0 0 0000204 [IWAIT] swi2: cambio
17 c32dac48 0 0 0 0000204 [IWAIT] swi5: +
16 c3319000 0 0 0 0000204 [SLPQ - 0xc06b6b60][SLP] yarrow
4 c331920c 0 0 0 0000204 [SLPQ - 0xc06b7828][SLP] g_down
3 c3319418 0 0 0 0000204 [SLPQ - 0xc06b7824][SLP] g_up
2 c32d5000 0 0 0 0000204 [SLPQ - 0xc06b781c][SLP] g_event
15 c32d520c 0 0 0 0000204 [IWAIT] swi1: net
14 c32d5418 0 0 0 0000204 [IWAIT] swi3: vm
13 c32d5624 0 0 0 000020c [IWAIT] swi4: clock sio
12 c32d5830 0 0 0 000020c [CPU 0] idle: cpu0
11 c32d5a3c 0 0 0 000020c [CPU 1] idle: cpu1
1 c32d5c48 0 0 1 0004200 [SLPQ wait 0xc32d5c48][SLP] init
10 c32da000 0 0 0 0000204 [SLPQ ktrace 0xc06b8258][SLP] ktrace
0 c06b7920 0 0 0 0000200 [IWAIT] swapper
db> tr 524
Tracing pid 524 tid 100057 td 0xc35e1d80
sched_switch(c35e1d80,0,1,10a,73683eb3) at sched_switch+0x190
mi_switch(1,0,c066587f,1ba,c35e020c) at mi_switch+0x2e6
sleepq_switch(c35e020c,c06b9a00,1,c0661d3b,0) at sleepq_switch+0x112
sleepq_wait_sig(c35e020c,0,c0663282,c8,100) at sleepq_wait_sig+0x25
msleep(c35e020c,c35e0274,15c,c0667749,0) at msleep+0x326
kern_wait(c35e1d80,ffffffff,dab4cc7c,6,0) at kern_wait+0x8bd
wait4(c35e1d80,dab4cd04,10,41d,4) at wait4+0x3c
syscall(3b,3b,3b,1,0) at syscall+0x300
Xint0x80_syscall() at Xint0x80_syscall+0x1f
--- syscall (7, FreeBSD ELF32, wait4), eip = 0x2829d273, esp =
0xbfbfe56c, ebp = 0xbfbfe588 ---
db> tr 544
Tracing pid 544 tid 100090 td 0xc36c0000
sched_switch(c36c0000,0,1,10a,753725b3) at sched_switch+0x190
mi_switch(1,0,c066587f,1ba,c36bcc48) at mi_switch+0x2e6
sleepq_switch(c36bcc48,c06b9a00,1,c0661d3b,0) at sleepq_switch+0x112
sleepq_wait_sig(c36bcc48,0,c0663282,c8,100) at sleepq_wait_sig+0x25
msleep(c36bcc48,c36bccb0,15c,c0667749,0) at msleep+0x326
kern_wait(c36c0000,222,dabc3c7c,0,0) at kern_wait+0x8bd
wait4(c36c0000,dabc3d04,10,41d,4) at wait4+0x3c
syscall(3b,3b,3b,8050100,2) at syscall+0x300
Xint0x80_syscall() at Xint0x80_syscall+0x1f
--- syscall (7, FreeBSD ELF32, wait4), eip = 0x280d4273, esp =
0xbfbfe30c, ebp = 0xbfbfe328 ---
db> tr 511
Tracing pid 511 tid 100080 td 0xc35e2c00
sched_switch(c35e2c00,0,1,10a,ba5fc6b3) at sched_switch+0x190
mi_switch(1,0,c066587f,1ba,c36bb624) at mi_switch+0x2e6
sleepq_switch(c36bb624,c06b9a00,1,c0661d3b,0) at sleepq_switch+0x112
sleepq_wait_sig(c36bb624,0,c0663282,c8,100) at sleepq_wait_sig+0x25
msleep(c36bb624,c36bb68c,15c,c0667749,0) at msleep+0x326
kern_wait(c35e2c00,ffffffff,dab67c7c,6,0) at kern_wait+0x8bd
wait4(c35e2c00,dab67d04,10,41d,4) at wait4+0x3c
syscall(3b,3b,bfbf003b,1,0) at syscall+0x300
Xint0x80_syscall() at Xint0x80_syscall+0x1f
--- syscall (7, FreeBSD ELF32, wait4), eip = 0x2829d273, esp =
0xbfbfe88c, ebp = 0xbfbfe8a8 ---
db> show allpcpu
Current CPU: 0

cpuid = 0
curthread = 0xc32d6900: pid 12 "idle: cpu0"
curpcb = 0xd44dad90
fpcurthread = none
idlethread = 0xc32d6900: pid 12 "idle: cpu0"
APIC ID = 1
currentldt = 0x50
spin locks held:

cpuid = 1
curthread = 0xc32d6780: pid 11 "idle: cpu1"
curpcb = 0xd44d7d90
fpcurthread = none
idlethread = 0xc32d6780: pid 11 "idle: cpu1"
APIC ID = 0
currentldt = 0x50
spin locks held:

db> show alllocks
db> show lockedvnods
Locked vnodes

0xc35d76cc: tag syncer, type VNON
usecount 1, writecount 0, refcount 2 mountedhere 0
flags ()
lock type syncer: EXCL (count 1) by thread 0xc32dbc00 (pid 35)#0
0xc04d300c at lockmgr+0x5bc
#1 0xc0541a72 at vop_stdlock+0x32
#2 0xc06419d4 at VOP_LOCK_APV+0xb4
#3 0xc055b77c at vn_lock+0xec
#4 0xc054beb2 at sync_vnode+0x132
#5 0xc054c1ff at sched_sync+0x26f
#6 0xc04c7851 at fork_exit+0xc1
#7 0xc0614fac at fork_trampoline+0x8


0xc363c414: tag ufs, type VREG
usecount 1, writecount 1, refcount 1536 mountedhere 0
flags ()
v_object 0xc36c2210 ref 0 pages 52780
lock type ufs: EXCL (count 1) by thread 0xc35e2480 (pid 515) with 1
pending#0 0xc04d300c at lockmgr+0x5bc
#1 0xc05b7ac6 at ffs_lock+0xa6
#2 0xc06419d4 at VOP_LOCK_APV+0xb4
#3 0xc055b77c at vn_lock+0xec
#4 0xc373e485 at mdstart_vnode+0xe5
#5 0xc373ec5f at md_kthread+0x14f
#6 0xc04c7851 at fork_exit+0xc1
#7 0xc0614fac at fork_trampoline+0x8

ino 1515, on dev aacd0s1f

0xc368f000: tag ufs, type VDIR
usecount 4, writecount 0, refcount 6 mountedhere 0
flags ()
v_object 0xc360318c ref 0 pages 1
lock type ufs: EXCL (count 1) by thread 0xc3573d80 (pid 547)#0
0xc04d300c at lockmgr+0x5bc
#1 0xc05b7ac6 at ffs_lock+0xa6
#2 0xc06419d4 at VOP_LOCK_APV+0xb4
#3 0xc055b77c at vn_lock+0xec
#4 0xc0543ce6 at lookup+0xe6
#5 0xc0543918 at namei+0x488
#6 0xc055467f at kern_lstat+0x4f
#7 0xc05545ff at lstat+0x2f
#8 0xc062aea0 at syscall+0x300
#9 0xc0614f9f at Xint0x80_syscall+0x1f

ino 3, on dev md0a

0xc3777c3c: tag ufs, type VREG
usecount 1, writecount 0, refcount 239 mountedhere 0
flags ()
lock type ufs: EXCL (count 1) by thread 0xc35e2300 (pid 546) with 1
pending#0 0xc04d300c at lockmgr+0x5bc
#1 0xc0542cd6 at vfs_hash_insert+0x36
#2 0xc05b657e at ffs_vget+0x1ce
#3 0xc05960c7 at ffs_valloc+0x137
#4 0xc05c4d19 at ufs_makeinode+0x79
#5 0xc05c1826 at ufs_create+0x36
#6 0xc063f332 at VOP_CREATE_APV+0xd2
#7 0xc05a015a at ffs_snapshot+0x33a
#8 0xc05b3cb1 at ffs_mount+0xa81
#9 0xc05469fe at vfs_domount+0x6be
#10 0xc05460ea at vfs_donmount+0x47a
#11 0xc054906e at kernel_mount+0x7e
#12 0xc05b3ee4 at ffs_cmount+0x84
#13 0xc0546326 at mount+0x1e6
#14 0xc062aea0 at syscall+0x300
#15 0xc0614f9f at Xint0x80_syscall+0x1f

ino 4, on dev md0a
db> where 35
Tracing pid 35 tid 100030 td 0xc32dbc00
sched_switch(c32dbc00,0,1,10a,3a53d433) at sched_switch+0x190
mi_switch(1,0,c066587f,1ba,1) at mi_switch+0x2e6
sleepq_switch(c363c46c,0,c066587f,20c,d451ca24) at sleepq_switch+0x112
sleepq_wait(c363c46c,0,c0663282,c8,0) at sleepq_wait+0x65
msleep(c363c46c,c06b96fc,50,c0669f9f,0) at msleep+0x335
acquire(d451cad0,40,60000,b1,c32dbc00) at acquire+0x8e
lockmgr(c363c46c,2002,c363c4dc,c32dbc00,c363c4dc) at lockmgr+0x516
ffs_lock(d451cb38,d451cb1c,c04d73fd,2002,c363c414) at ffs_lock+0xa6
VOP_LOCK_APV(c06a5920,d451cb38,c0673d22,d451cb3c,c050ccb0) at
VOP_LOCK_APV+0xb4
vn_lock(c363c414,2002,c32dbc00,7a5,2002) at vn_lock+0xec
vget(c363c414,2002,c32dbc00,2fc,c3558c90) at vget+0xff
qsync(c3558c00,0,c0673039,47c,c0661d3b) at qsync+0x13d
ffs_sync(c3558c00,3,c32dbc00,c32dbc00,c3558c00) at ffs_sync+0x392
sync_fsync(d451cca0,c0680e2f,c35d76cc,c35d76cc,c35d77d8) at sync_fsync+0x19e
VOP_FSYNC_APV(c069f540,d451cca0,c32dbc00,620,0) at VOP_FSYNC_APV+0xd2
sync_vnode(c35d77d8,c32dbc00,c066c1b0,657,0) at sync_vnode+0x158
sched_sync(0,d451cd38,c065fd98,31d,0) at sched_sync+0x26f
fork_exit(c054bf90,0,d451cd38) at fork_exit+0xc1
fork_trampoline() at fork_trampoline+0x8
--- trap 0x1, eip = 0, esp = 0xd451cd6c, ebp = 0 ---
db> where 515
Tracing pid 515 tid 100085 td 0xc35e2480
sched_switch(c35e2480,0,1,10a,f85dbeb3) at sched_switch+0x190
mi_switch(1,0,c066587f,1ba,1) at mi_switch+0x2e6
sleepq_switch(c0707be4,0,c066587f,20c,dab58894) at sleepq_switch+0x112
sleepq_wait(c0707be4,0,c0663282,c8,0) at sleepq_wait+0x65
msleep(c0707be4,c0707c00,44,c066a543,0) at msleep+0x335
waitrunningbufspace(c363c520,cd895584,cd8955e4,4000,cd895584) at
waitrunningbufspace+0x72
bufwrite(cd895584,c05b8419,c06400ac,246,c06969c4) at bufwrite+0x1a1
vfs_bio_awrite(cd895584,0,c06733a7,e4,c80000) at vfs_bio_awrite+0x29e
ffs_syncvnode(c363c414,2,c06a5920,dab58980,c0640922) at ffs_syncvnode+0x352
ffs_fsync(dab589bc,c0680e2f,c35e2480,c35e2480,cd81e4b8) at ffs_fsync+0x1c
VOP_FSYNC_APV(c06a5920,dab589bc,c066a527,37f,c363c414) at VOP_FSYNC_APV+0xd2
bdwrite(cd81e4b8,c3671948,cd851fa8,7fa,54c540) at bdwrite+0x12b
ffs_balloc_ufs2(c363c414,f6352000,2f,2000,c3655300) at
ffs_balloc_ufs2+0x193e
ffs_write(dab58c78,c0680c61,0,0,0) at ffs_write+0x369
VOP_WRITE_APV(c06a5920,dab58c78,c35e2480,1ea,c3558c00) at
VOP_WRITE_APV+0x17c
mdstart_vnode(c36b2000,c37df39c,c373ff9e,2a3,0) at mdstart_vnode+0x126
md_kthread(c36b2000,dab58d38,c065fd98,31d,c35e2480) at md_kthread+0x14f
fork_exit(c373eb10,c36b2000,dab58d38) at fork_exit+0xc1
fork_trampoline() at fork_trampoline+0x8
--- trap 0x1, eip = 0, esp = 0xdab58d6c, ebp = 0 ---
db> where 547
Tracing pid 547 tid 100067 td 0xc3573d80
sched_switch(c3573d80,0,1,10a,5da4c133) at sched_switch+0x190
mi_switch(1,0,c066587f,1ba,1) at mi_switch+0x2e6
sleepq_switch(c3777c94,0,c066587f,20c,dab2e71c) at sleepq_switch+0x112
sleepq_wait(c3777c94,0,c0663282,c8,0) at sleepq_wait+0x65
msleep(c3777c94,c06b8814,50,c0669f9f,0) at msleep+0x335
acquire(dab2e7c8,40,60000,b1,c3573d80) at acquire+0x8e
lockmgr(c3777c94,2002,c3777d04,c3573d80,c3777d04) at lockmgr+0x516
ffs_lock(dab2e830,dab2e814,c04d73fd,2002,c3777c3c) at ffs_lock+0xa6
VOP_LOCK_APV(c06a5920,dab2e830,c066b6c8,dab2e834,c050ccb0) at
VOP_LOCK_APV+0xb4
vn_lock(c3777c3c,2002,c3573d80,7a5,2002) at vn_lock+0xec
vget(c3777c3c,2002,c3573d80,50,dab2ebc0) at vget+0xff
vfs_hash_get(c3429c00,4,2,c3573d80,dab2e98c) at vfs_hash_get+0xe2
ffs_vget(c3429c00,4,2,dab2e98c,dab2e990) at ffs_vget+0x49
ufs_lookup(dab2ea40,c0680949,c368f000,c368f000,dab2ebc0) at ufs_lookup+0xbdf
VOP_CACHEDLOOKUP_APV(c06a5920,dab2ea40,dab2ebc0,c3573d80,c376f380) at
VOP_CACHEDLOOKUP_APV+0xd2
vfs_cache_lookup(dab2eaec,dab2eaec,0,c368f000,dab2ebc0) at
vfs_cache_lookup+0xd0
VOP_LOOKUP_APV(c06a5920,dab2eaec,c3573d80,3,1) at VOP_LOOKUP_APV+0xb4
lookup(dab2eb98,0,c066b85d,b6,6b2) at lookup+0x528
namei(dab2eb98,dab2ebe8,60,854,c3573d80) at namei+0x488
kern_lstat(c3573d80,80524a8,0,dab2ec6c,dab2ec88) at kern_lstat+0x4f
lstat(c3573d80,dab2ed04,8,41d,2) at lstat+0x2f
syscall(3b,3b,3b,8052448,8052400) at syscall+0x300
Xint0x80_syscall() at Xint0x80_syscall+0x1f
--- syscall (190, FreeBSD ELF32, lstat), eip = 0x28182613, esp =
0xbfbfe55c, ebp = 0xbfbfe5f8 ---
db> where 546
Tracing pid 546 tid 100086 td 0xc35e2300
sched_switch(c35e2300,0,1,10a,6af4f133) at sched_switch+0x190
mi_switch(1,0,c066587f,1ba,2) at mi_switch+0x2e6
sleepq_switch(c0707be4,0,c066587f,20c,dab5560c) at sleepq_switch+0x112
sleepq_wait(c0707be4,0,c0663282,c8,0) at sleepq_wait+0x65
msleep(c0707be4,c0707c00,44,c066a543,0) at msleep+0x335
waitrunningbufspace(c3777d48,cd832380,c3527c00,c3527c00,c3580000) at
waitrunningbufspace+0x72
bufwrite(cd832380,0,dab55934,c05a043f,cd832380) at bufwrite+0x1a1
bawrite(cd832380,4a030000,2b,4000,c3655300) at bawrite+0x6b
ffs_snapshot(c3429c00,c3572680,dab559a8,6c,1) at ffs_snapshot+0x61f
ffs_mount(c3429c00,c35e2300,c066ba58,331,c06c0ea0) at ffs_mount+0xa81
vfs_domount(c35e2300,c354a680,c3391030,1211000,c3391230) at
vfs_domount+0x6be
vfs_donmount(c35e2300,1211000,dab55bf4,c3779080,e) at vfs_donmount+0x47a
kernel_mount(c3391910,1211000,dab55c38,6c,805bb00) at kernel_mount+0x7e
ffs_cmount(c3391910,bfbfec70,1211000,c35e2300,c06a5600) at ffs_cmount+0x84
mount(c35e2300,dab55d04,c067d6fd,3cb,4) at mount+0x1e6
syscall(3b,3b,3b,bfbfec70,805dab8) at syscall+0x300
Xint0x80_syscall() at Xint0x80_syscall+0x1f
--- syscall (21, FreeBSD ELF32, mount), eip = 0x280cddb7, esp =
0xbfbfea0c, ebp = 0xbfbfed18 ---
db>

OK, please, provide also your fstab, information on md config
and dmesg, and kernel config. Also, it would be good to see the
output of "alltrace" in ddb. It seems that your kernel does not
contain quota option ?

Did your system performed bg fsck and you tried to create vnode-backed md
device, right ?

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